We present a highly sensitive 2D line survey of TMC-1 obtained with the Yebes
40m radio telescope in the Q-band (31.13-49.53 GHz). These maps cover a region
of 320 arcsec x 320 arcsec centred on the position of the QUIJOTE line survey
with a spatial sampling of 20 arcsec. The region covering 240 arcsec x 240
arcsec, where a longer integration time was used, shows a homogenous
sensitivity of 2-4 mK across the band. We present in this work the first
determination of the spatial extent of benzonitrile (C6H5CN), which follows
that of cyanopolyynes rather well, but differs significantly from that of the
radicals CnH and CnN. We definitively conclude that aromatic species in TMC-1
are formed from chemical reactions involving smaller species in the densest
zones of the cloud.Comment: Accepted for publication in A&A Letter